I might sound crazy doing this but we live in a rural area. During power outages it is a good time for looters to be about. Because of that we make sure we have our generator chained and padlocked to something that will not move. Garage door or built in work bench is what we usually use.




. I can see how it's best to wait until the rain is over to run the generator. However considering how long this weather event could be it may be necessary to run the generator if we lose power and the basement starts going under water. Is there some way to shelter it? (I know not in the garage)
The only problem is that if the winds are strong enough, which they have been here and we aren't even close to the storm, it could blow that set-up away. Just do the best that you can for this storm. You can come up with a permanent solution later on. 